markf Posted February 21, 2007 Share Posted February 21, 2007 Still hoping someone can help with my previous window glass post. Attached are 2 renderings. Test01-QMC uses QMC for secondary bounce. Test01-LC01 uses light cache for secondary bounce. Allother settings remain the same. The light cache has really cast a color abour the enire scene. I have tried adjusting secondary bounce multiplier, subdivs and sample size. These have some effect but I cannot get the light cache image to look like the QMC. Any advice on this? Second question- I read that there was a way to see before rendering how long the render will take. Where can I find this? Thanks in advance for any help. Link to comment Share on other sites More sharing options...
jophus14 Posted February 22, 2007 Share Posted February 22, 2007 Vray version 1.5 has an estimated timer for the calculations. The time bounces back and forth depending on what is getting rendered at that time. Example: If your rendering a smooth wall the timer say it'll finish rendering in 5minutes, but when it hits a pane of glass with reflections, the timer will jump up to 10 or 15 minutes to finish. As far as your light cache situation, did you try adjusting the light and dark multiplier in the Color Mapping rollout? Link to comment Share on other sites More sharing options...
markf Posted February 22, 2007 Author Share Posted February 22, 2007 Joseph, Thanks for your reply. I'm using Vray 1.5. Where do I access this timer? I have not tried the light and dark multiplier in the color mapping. I will have to look into that. It was not covered in the tutorials I have done so far. I'm ne to Vray and sort of stuggling to understand how to control it. Thanks again for your help! This forum comtinues to be invaluable, thanks to the many pros who are willing to offer thier expertise. Link to comment Share on other sites More sharing options...
plastic Posted February 22, 2007 Share Posted February 22, 2007 QMC for secondary bounces only does 2 bounces by default. the lightcache has no limit on bounces, so what you see with the lightcache pic is the physically correct lighting. the problem is that the calculations are done with gamma 1.0 internally, and the input/output is gamma 2.2 (probably), that's why you are getting excessive color bleeding. the fix is using "linear workflow", which means setting up the gamma correctly and readjusting the material values. there is tons of info about this topic at the vray forum: http://www.chaosgroup.com/forum/phpBB2/ Link to comment Share on other sites More sharing options...
markf Posted February 22, 2007 Author Share Posted February 22, 2007 I have seen mention of this LWF. Yikes, I'm afraid to get into gamma issues at this stage. Just want to get a decent rendering for now. Hope to look into LWF in the future. Is it possible to use light cache (and not get excessive color bleeding) without going down the LWF road? Thanks for taking the time to reply! Link to comment Share on other sites More sharing options...
manta Posted February 22, 2007 Share Posted February 22, 2007 Is it possible to use light cache (and not get excessive color bleeding) without going down the LWF road? Thanks for taking the time to reply! Yes, drop the saturation in your GI rollout... Link to comment Share on other sites More sharing options...
devgun Posted February 26, 2007 Share Posted February 26, 2007 manta is right.. just decrease the saturation value.. it should do the trick Link to comment Share on other sites More sharing options...
markf Posted February 26, 2007 Author Share Posted February 26, 2007 Thank you for your help. I will use decrease the saturation and see how it goes. I have gotten good results on my first rendering with Vray using QMC for second bounce. There seems to be some very slight noise across most of the walls and ceiling. I'm going to post the image as another thread and see if anyone else can see this noise, thinks it could be elimated and what adjustment to make. Link to comment Share on other sites More sharing options...
only3d Posted February 27, 2007 Share Posted February 27, 2007 i cant help thinking.. if ur happy with the QMC shot then why bother trying to get the LC shot look the same...? Link to comment Share on other sites More sharing options...
markf Posted February 27, 2007 Author Share Posted February 27, 2007 only, Good question. I'm new to Vray, I have read that LC is the most commonly used second bounce, want to see speed and quality comparison with QMC. Don't have anything else to do but experiment with this kind of stuff...........not Link to comment Share on other sites More sharing options...
jophus14 Posted February 27, 2007 Share Posted February 27, 2007 markf: What software are you using for the images in the gallery of your website? Link to comment Share on other sites More sharing options...
markf Posted February 27, 2007 Author Share Posted February 27, 2007 The renderings are done with 3DS Max, illustrations with illustrator and of course photoshop is used in both. I'm just starting to use Vray as of about 1 week ago. Why do you ask? Link to comment Share on other sites More sharing options...
Trevor Tizard Posted February 27, 2007 Share Posted February 27, 2007 markf, You can also use the vray override material to have more control over colour bleeding. Link to comment Share on other sites More sharing options...
markf Posted February 27, 2007 Author Share Posted February 27, 2007 Trevor, Thank you for that tip. I haven't learned about the overide mat. I'll look into it. Link to comment Share on other sites More sharing options...
only3d Posted February 27, 2007 Share Posted February 27, 2007 only, Good question. I'm new to Vray, I have read that LC is the most commonly used second bounce, want to see speed and quality comparison with QMC. Don't have anything else to do but experiment with this kind of stuff...........not HAHA i know what u mean.. its all im doing the last 2 weeks..(!) i just posted a new thread on the subject by the way good luck on your journey Link to comment Share on other sites More sharing options...
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